Write md2_update function.

git-svn-id: https://src.develer.com/svnoss/bertos/trunk@749 38d2e660-2303-0410-9eaa-f027e97ec537

diff --git a/algos/md2.c b/algos/md2.c
index 9f4099dae3a65b3755666c31f7cbea2276e21e3b..b8caeade9b14675d84e59ce6b9b486cebb3b31dd 100755 (executable)
--- a/algos/md2.c
+++ b/algos/md2.c
@@ -13,6 +13,9 @@
 
 /*#*
  *#* $Log$
+ *#* Revision 1.5  2007/01/31 16:42:43  asterix
+ *#* Write md2_update function.
+ *#*
  *#* Revision 1.4  2007/01/31 13:51:57  asterix
  *#* Write md2_compute function.
  *#*
@@ -125,7 +128,7 @@ static void md2_compute(void *state, void *checksum, void *block)
  */
 void md2_init(Md2Context *context)
 {
-       context->counter=0;
+       context->counter = 0;
        memset(context->state, 0, sizeof(context->state));
        memset(context->checksum, 0, sizeof(context->checksum));
 
@@ -138,9 +141,45 @@ void md2_init(Md2Context *context)
  */
 void md2_update(Md2Context *context, void *block_in, size_t block_len)
 {
+       uint8_t store_block_len;    //Lenght of block store in context buffer
+       uint8_t empty_block_len;    //Lenght of block empty in context buffer
+       
+       store_block_len = context->counter;
+       empty_block_len = CONFIG_MD2_BLOCK_LEN - store_block_len;
+       
+       /*
+        * Fill context buffer with input block and compute it.
+        */
+       if(block_len > empty_block_len)
+       {
+               memcpy(context->buffer[store_block_len], block_in, empty_block_len);
+               md2_compute(context->state, context->checksum, context->buffer);
+               block_len -= empty_block_len;
+       }
+       else
+       {
 
-}
+               memcpy(context->buffer[store_block_len], block_in, block_len);
+               context->counter += block_len;
+
+       }
+       
+       /*
+        * Split input in block long CONFIG_MD2_BLOCK_LEN and compute it.
+        */
+       for(int i = empty_block_len + 1;  i + CONFIG_MD2_BLOCK_LEN < block_len; i += CONFIG_MD2_BLOCK_LEN)
+       {
+               memcpy(context->buffer, block_in[i], CONFIG_MD2_BLOCK_LEN);
+               md2_compute(context->state, context->checksum, context->buffer);
+       }
 
+       /*
+        * Copy remaining block in context buffer and update context counter.
+        */
+       memcpy(context->buffer, block_in[i], block_len - i);
+       context->counter = block_len - i;
+       
+}
 /**
  * 
  */